665734403 has 2 divisors, whose sum is σ = 665734404. Its totient is φ = 665734402.

The previous prime is 665734397. The next prime is 665734409. The reversal of 665734403 is 304437566.

665734403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (665734397) and next prime (665734409).

It is a cyclic number.

It is not a de Polignac number, because 665734403 - 2¹⁴ = 665718019 is a prime.

It is equal to p_34568633 and since 665734403 and 34568633 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (665734409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332867201 + 332867202.

It is an arithmetic number, because the mean of its divisors is an integer number (332867202).

Almost surely, 2^665734403 is an apocalyptic number.

665734403 is a deficient number, since it is larger than the sum of its proper divisors (1).

665734403 is an equidigital number, since it uses as much as digits as its factorization.

665734403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 38.

The square root of 665734403 is about 25801.8294506417. The cubic root of 665734403 is about 873.1730711145.

The spelling of 665734403 in words is "six hundred sixty-five million, seven hundred thirty-four thousand, four hundred three".